Classification of Epithelial Tissue

Classification of Epithelial Tissue Location of Epithelium The four basic tissue types in the body are the epithelial, connective, muscular, and nervous tissue. These tissues exist and function in close association with one another. The epithelial tissue, or epithelium, consists of sheets of cells that cover the external surfaces of the body, line the internal cavities, form various organs and glands, and line their ducts. Epithelial cells are in contact with each other, either in a single layer or multiple layers. The structure of lining epithelium, however, differs from organ to organ, depending on its location and function.For example, epithelium that covers the outer surfaces of the body and serves as a protective layer differs from the epithelium that lines the internal organs. The overview illustration shows different types of epithelia in selected organs. Classification of Epithelium Epithelium is classified according to the number of cell layers and the morphology or structur e of the surface cells. A basement membrane is a thin, noncellular region that separates the epithelium from the underlying connective tissue. This membrane is easily seen with a light microscope.An epithelium with a single layer of cells is simple, and that with numerous cell layers is stratified. A pseudostratified epithelium consists of a single layer of cells that attach to a basement membrane, but not all cells reach the surface. An epithelium with flat surface cells is called squamous. When the surface cells are round, or as tall as they are wide, the epithelium is cuboidal. When the cells are taller than they are wide, the epithelium is called columnar. Epithelium is nonvascular, that is, it does not have blood vessels.Oxygen, nutrients, and metabolites diffuse from the blood vessels located in the underlying connective tissue to the epithelium. Special Surface Modifications on Epithelial Cells Epithelial cells in different organs exhibit special cell membrane modifications o n their apical orupper surfaces. These modifications are cilia, stereocilia, or microvilli. Cilia are motile structures found on certain cells in the uterine tubes, uterus, and conducting tubes of the respiratory system. Microvilli are small, nonmotile projections that cover ll absorptive cells in the small intestine and proximal convoluted tubules in the kidney. Stereocilia are long, nonmotile, branched microvilli that cover the cells in the epididymis and vas deferens. The function of microvilli and stereocilia is absorption. Types of Epithelia Simple Epithelium Simple squamous epithelium that covers the external surfaces of the digestive organs, lungs, and heart is called mesothelium. Simple squamous epithelium that covers the lumina of the heart chambers, blood vessles, and lymphatic vessels is called endothelium.

Beware of the dog

Beware of the Dog: The story is about a pilot during the second world war, the story took place in the area which consists of Britain, France and Germany. The story began while the pilot had a severe injury in his leg which is caused by him getting shot during his flight. He lost the down part of his leg, right down his thigh. In the beginning the pilot was in his cockpit trying to imagine how he will make fun of his injury like it is nothing and it doesnt bother him at all and how he will make fun from it with his comrades and wife. A few moments later he realized that wasnt the real case and the pain was so much until a degree he thought that he was going to pass out; so he decided to bail out before that happens. But regardless what he did, he lost consciousness before he landed. And when he regained his consciousness he found himself in a hospital where there was an army doctor and a nurse who took care of him for few days, the nurse told him he is in Brighton. But while he was laying in his bed he listened to a noise and he could recognize it from the sound of the engines as a German airplanes. And so he asked the nurse about it but she told him he might be mistaken. Later next evening he heard a noise again and it worried him greatly. After that he wanted to check where he really is. He endured his pain and crawled to reach the window and looked outside when he saw a sign where there was something written on it with white paint. He managed at last to read the letters Garde au chien then he looked around and saw the small orchard on the left of a cottage, and just at that moment he realized he is in France. There was just sentence running through his head, a sentence which the intelligent officer of his squadron always repeated to the pilots And if they get you, dont forget, just your name, rank and number. Nothing else. For Gods sake, say nothing else. Later that morning an ordinary R A F officer from the Air Ministry came and told the pilot that he need to answer a few questions to fill the combat report. The pilot in the bed just said My name is Peter Williamson. My rank is Squadron Leader and my number is 972457. Mohanad Zeitoun, gruppe: 120 th

Ethics & Criminal Justice Essay Example | Topics and Well Written Essays - 1000 words

Ethics & Criminal Justice - Essay Example Moreover, Schafer also contends that when confronted with an ethical predicament, most of us would try to involve balance in our decision making process which has either long term or short tem consequences. The author, furthermore, describes a 'fit' - a 'good fit' results to equilibrium while a 'bad fit' increases conflict. Thus, according to the author, leading an ethical life decreases our confrontation with ethical predicaments. As constraints in time limit clear thinking, individuals must make ethical choices giving sufficient considerations to the consequent 'dilemmas' which may arise from the previous choices we have made. For the author, ethical decisions 'consist of a series of choices', not a single decision, hence, as ethics cements and builds strength of personal character, it does not come free of pain (Schafer 2002). Similarly, defining ethical behavior does not come free of pain and constraints. Each of us has her own definition of ethics and morality molded mainly by our environment, our individual perception or our personal experiences and our cultures. Thus, the dilemma in ethics is also a dilemma in bestowing it 'justifiable' definitions. Our predecessors, as well as contemporary thinkers and philosophers from the age of antiquity, of various cultures and beliefs were not spared of this predicament. Consequently, one takes a subjective characterization of ethical standards based on our justice system, local regulations, religion, education, culture and our surroundings. What results is a more relative view of ethics versus the ideal ones proposed by Plato or Socrates or Heraclitus. The relative view versus the ideal and universal definition of ethics presents a dilemma since we do not know when to draw the line between realistic ethical applications from the ideal ethical propositions or wh en and how to apply both principles. Hence, I take the prevailing social and cultural view of what ethical behavior should be. Since society is a result of adaptation to the changes that occurred in our environment, and aims to provide protection of right and promotion of justice, social, legal and cultural standards - standards enshrined, for instance, in our Constitution, laws, social norms, acceptable behavior - of ethical principles, these standards should be the guiding principles of ethical behavior. However, the implications of these principles as defined by our system and aforementioned ethical bases are that, ethical standards and principles evolve over time. 'Evolve' for me, does not really mean 'improve' or 'progress' but rather 'change' for the purpose of adaptation or the preservation of life, liberty, respect for the rights of others and justice or fairness. These ideals, norms and even 'realities' of ethical standards are evident in almost every culture in every commu nity and units of society all across the globe. Thus, even though they are not perfect, ethical principles in my society are 'justifiable' definitions as, apparently, the same ideals exist in other societies, and therefore I take that what is right and 'just' in the society I live in, should be applied using the full force of the law, even if the application of such principles cause much grief. As aforementioned, such principles and ideals of ethics should evolve and

Argument Essay Example | Topics and Well Written Essays - 2000 words

Argument - Essay Example I believe that in our judgments about reality we cannot abstract ourselves from the sensual reactions and subjective judgments; as a result, empiricism is the philosophy that is closer to the reality and reflects the true way of judging and evaluating the surrounding reality. Rationalism is an important trend in philosophy. Plato is fairly regarded as one of the basic proponents of rationalism in philosophy. Rationalism in general and Plato, in particular, assert that knowledge never comes from senses but is innate (Anonymous 335). As such, there is nothing sensual in nature and individuals who seek to objectivity in their judgments should rely on their innate knowledge and avoid using personal experience and observations. It should be noted, that where Plato opposes to the relevance of the senses as a potential source of reliable knowledge, his opposition is justified by the fact that the senses are bodily and thus morally tainted (Anonymous 335). Actually, everything associated with body, in Plato’s opinion, is morally tainted and cannot be considered as a good source of knowledge. Such rejection of the senses is the definitive feature of rationalism (Anonymous 335). To some extent, Plato’s arguments about the senses his opposition to using the senses as the source of knowledge are justified. He is confident that absolute truth and absolute good do exist (Anonymous 335). However, never in life was he able to perceive and grasp the meaning of these absolute beauties and absolute good with his senses; rather, a rational person in search for objective knowledge will do everything possible to develop an intellectual vision of reality which has nothing to do with the senses but applies to reason (Anonymous 335). Surprisingly or not, but in his defense of rationalism, Plato does not only exclude the senses as potential sources of knowledge but also implies that other emotions, including love, lust, fear, and

A review Article Example | Topics and Well Written Essays - 1500 words

A review - Article Example She sheds light on the uneasy relationship of Computer Assisted Language Learning (CALL) and Second Language Acquisition (SAL) processes and gives an account of the present state of the art and points towards the new and challenging directions of SAL. Chapelle writes â€Å"The point of departure for this article is the dissimilarity between the theoretical landscape within view of language teaching professionals in 1991 and that of today†. (p.741)The pragmatic goal of computer-assisted language learning (CALL) developers and researchers to create and evaluate learning opportunities and a variety of theoretical approaches to second language acquisition (SLA) which have developed, are alternative beats of the same heart. The multiple theoretical perspectives grouped into four general approaches support this perspective as elucidated by Chapelle who writes: â€Å"Cognitive linguistic (Universal Grammar, autonomous induction theory, and the concept-oriented approach); psycholinguistic (processibility theory, input processing theory, interactionist theory); human learning (associative-cognitive CREED, skill acquisition theory); and language in social context (sociocultural, language socialization, conversation analysis, systemic-functional, complexity theory)† ( p.741). Technological advances and internet revolution and the resultant changes have necessitated modifications of communicative competitive theory and this has proffered a direct challenge to Second Language Acquisition (SLA). This theory lays much emphasis on natural talents and process through which a student undergoes, than in instructed SLA. As per this theory, the learning process goes on without the student being actively conscious of it. The process is just like the elementary command on the mother-tongue exercised by a child even before going to school and that process of self-education goes within the perimeters of the household and immediate

Impact of Technology on Small Businesses Essay Example | Topics and Well Written Essays - 2750 words

Impact of Technology on Small Businesses - Essay Example In the present paper the impact of technology is critically analyzed to understand whether adopting technology in its various forms is profitable to small businesses or not through qualitative research methodology. Small businesses drive the economy by leading in innovation and very crucial for national economies because of their large contribution in terms of employment and turnover (Burns, 2007). Small Medium Enterprises (SME) according to the Bolton committee is defined as an independent local firm whose ownership and management is vested in the same individuals and market share is small. A firm is termed as SME when it meets two of the three criteria’s namely consisting â€Å"up to 250 employees, up to  £50 million annual turnover and  £43 million annual statement of financial position total† as given by the European Commission of 2003 (Amm, 2011, p.1). Small businesses like large firms, in their operations try to apply latest technologies in order to be competitive, knowledgeable, more efficient and eventually more profitable (Kierman, 1995). However it has been found that technology is also negatively affecting the small businesses by decreasing the personal aspect of the business relationship, surveillance and constant monitoring using technology is decreasing employee morale and productivity significantly and brick and mortar small stores are losing their market share to large companies who use technology extensively (Hanley, 2013) moreover technology brings change that might not be adopted well by employees and is expensive and keeps changing (Keirman, 1995 and Burgess, 2002). SME’s compared to larger firms respond quickly to market threats and opportunities because they are more market-driven than larger firms who are more research driven. And use innovative technology or technology innovatively in developing new markets and about ten percent of SMEs are technology based and can be termed as innovative.  

Stakeholder mapping Stakeholder analysis Essay Example | Topics and Well Written Essays - 2500 words

Stakeholder mapping Stakeholder analysis - Essay Example The stakeholders can very well be found beyond the formal structure of the company. Therefore in order to find out all the stakeholders, the company is also required to have a look at informal and indirect relationships as well. The company management has to make a balancing assessment and evaluate all such external forces in order to take them along with company’s objectives. Two major elements for stakeholder management are Stakeholder mapping and Stakeholder analysis. By managing the interest of stakeholders an organisation can enhance the wealth in such a manner that economic benefits can be generated by positive relationships between the organisation and its stakeholders (Preston and Donaldson, 1999). This necessitates that the service values as perceived by stakeholders are determined in an objective manner. This includes determination of elements like information and knowledge sharing about the functioning of the company, joint ventures, acquisitions and mergers, comple mentary resources and capabilities. In fact, at times, the operational direction of the company is set by the manner in which the stakeholders perceive the company, its missions and objectives. Key stakeholders like shareholders, employees, financers etc. often make use of influencing strategies to guide the organisation or to set the priorities for the company (Frooman, 1999). Therefore while taking crucial corporate decisions, it is necessary to know about the expectations of different stakeholders and to determine the extent to which they could and would exert their influence. Mitchell et al (1997) contend that an influential model of how stakeholders influence organisations is based on attributes of power, legitimacy and urgency. Johnson & Scholes (1999) define stakeholder as, â€Å"Stakeholders are groups or individuals who have a stake in, or expectation of, the organization’s performance.† Besides the owners